1-12.Double Chain Stitch Looper Mechanism - Brother RH-981A Service Manual
Electronic eyelet button holer
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Also See for RH-981A:
- Parts manual (109 pages) ,
- Instruction manual (89 pages) ,
- Specifications (8 pages)
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1. MECHANICAL DESCRIPTIONS
1-12. Double chain stitch looper mechanism
3. The rocking motions of the LS-holder bracket (6) and the spreader differential cam (10) cause spreader L (11) to
rock.
4. In the same way, spreader R (12) is rocked.
9
1. When the looper driving shaft (1) moves up and down,
the motion is transmitted to the looper link clamp (2),
and the looper link (3), which rocks LS-holder bracket
(6) with the holder support shaft (5) secured to the
loop base (4) regarded as the pivot.
2. When the spreader link shaft (7) moves up and down,
the motion is transmitted to the spreader link base (8)
and the spreader cam link (9), which then rocks the
spreader differential cam (10) with the holder support
shaft (5) secured to the loop base (4) regarded as the
pivot.
3692Q
RH-981A
3693Q
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